由于废弃物的堆积以及填埋场上覆盖层的重量，衬垫因此承受一定的压力，发生力学固结；由于黏土本身的结构特性，当污染物通过黏土垫层时可能会发生化学固结，而固结作用可直接对污染物的对流输运产生影响，也会引起土层体积和结构的变化，从而改变其固有的输运性质。从混合物理论出发，建立了水力-化学-力学作用下的溶质输运理论框架，统一地描述了水力-化学-力学作用下变形、水的吸附或解吸附、对流和扩散现象。将输运系数考虑为有效孔隙率的函数，由此反映固结对输运参数的影响。对所建立的数学模型进行无量纲化处理，并使用有限元软件COMSOL Multiphysics进行求解，最后进行了参数分析。研究结果表明，垫层土体中吸附水和自由水之间的化学势差异越大，层间吸附水的解吸附量越大；当土体的软硬性质不同时，当层间吸附水解吸附后，土体固结程度不同，从而对污染物输运过程的影响不同。而当垫层上覆荷载增大时，土体宏观孔隙的扩张的限制作用增强，从而对土体产生一种修复作用，抑制污染物在土体中的输运。

Due to waste accumulation and the capping weight of landfill, mechanical consolidation would happen in impervious barrier of the landfill liner under pressure. The chemical consolidation can also happen when the contaminant transports through the barrier. Then, the above effect of soil consolidation would not only induce contaminant advection, but also make the changes of its inherent transport property, such as soil volume and structural transformation. A hydro-chemo-mechanical contaminant transport framework is established, which is based on the mixture theory. It is able to describe systematically the coupling deformation under the hydro-chemo-mechanical effect, the water absorption and desorption, advection and diffusion. The influence of the hydro-chemo-mechanical coupling effect on the inherent transport property is considered with the changing of macroscopic pores. The contaminant transport is simulated using the coupling advection and diffusion flux. Then, the parametric analyses about consolidation load, diffusion-consolidation coefficient, coupling deformable effect, desorption effect and effective osmotic coefficient are progressed. The analyzing results indicate that if the difference between the adsorption water and free water in the soil of the landfill liner is larger, the more adsorption water would be desorbed. However, when the adsorption water is desorbed, the degree of soil consolidation would be changed with the soil characteristic which is hard or soft. If the overlying load is larger, the effect of limiting expansion of the macroscopic pore in the soil is larger. Subsequently, the velocity of contaminant transport would be reduced.